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zirtaeb



Joined: 03 Jul 2009
Posts: 3627

PostPosted: Sat Oct 08, 2016 8:09 pm    Post subject: Reply with quote

Depend on preferences and body build.
At 5'10" and 150 lbs., I go 7" higher than slalom.
Some really tall guys use about the same boom heights for Formula, but higher than my 54" for their slalom sailing.
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DanWeiss



Joined: 24 Jun 2008
Posts: 2213
Location: Connecticut, USA

PostPosted: Sun Oct 09, 2016 12:32 am    Post subject: Reply with quote

atlas.wave55 wrote:
I am unsure of what height to set the boom for a formula board with big sail.I know a guideline is somewhere in between shoulder and chin height but should I set it a bit higher like forehead.Would it help to plane earlier with a higher boom set up?


Since you will stand farther from the mast foot on a wide FW board than on nearly anything else, your boom height must move up, likely higher than anything else you've sailed. At 5'6" my booms are over my head when standing the rig upright on the board. The booms will come down to you as the sail sweeps back and rakes to windward.

If your booms are too low you surrender the power you need from the rig to really get going in light winds.

High booms are why FW racers must use especially long harness lines apart from the obvious need for adjustability.

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techno900



Joined: 28 Mar 2001
Posts: 2823

PostPosted: Mon Oct 10, 2016 8:44 am    Post subject: Reply with quote

I know I have my boom too low, but when I do free sail formula, I am in gusty winds (0-20) at times and I like to stay hooked in while slogging. So, My boom is usually no higher than shoulder. Also, I think it is easier and more efficient to pump with a lower boom, and that's the only way to get planing in light winds.
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bred2shred



Joined: 02 May 2000
Posts: 897
Location: Jersey Shore

PostPosted: Mon Oct 10, 2016 11:14 am    Post subject: Reply with quote

Start with the boom around chin to mouth height when standing static on the board. If you set it at the same height you would use on a "normal" board, it will be too low when you're powered up in the straps on a Formula board.

sm
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DanWeiss



Joined: 24 Jun 2008
Posts: 2213
Location: Connecticut, USA

PostPosted: Mon Oct 10, 2016 1:17 pm    Post subject: Reply with quote

The most powerful pumping action itself occurs with the booms at shoulder level. However, a higher boom increases your leverage over the rig as you must pump the entire sail, most of it very high above.

Another thing about high booms is using long lines, ideally adjustable. Long lines will allow you plane very early without pumping on wide FW-style boards because you will not oversheet when moving back to final sailing location. Short lines will cause oversheeting and stall the sail.

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atlas.wave55



Joined: 24 Aug 2016
Posts: 49

PostPosted: Fri Jun 23, 2017 6:14 pm    Post subject: Reply with quote

277 days later from my first post on this topic...
This Wednesday I bought a Formula 136 2002. It is in good condition, no repairs and came with a 47 cm weed fin and board bag. I will be taking it out for my first run on it this weekend Very Happy

Thanks for all the discussion and good information on this topic!
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jingebritsen



Joined: 21 Aug 2002
Posts: 3203

PostPosted: Fri Jun 23, 2017 7:24 pm    Post subject: Reply with quote

if you do not need weed fins, do not use them.

formula is all about extreme angles of attack. upwind and down. weed fins suck at that.

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atlas.wave55



Joined: 24 Aug 2016
Posts: 49

PostPosted: Sun Jun 25, 2017 3:36 pm    Post subject: Reply with quote

The fin I used was a true ames 47cm weed fin yesterday and it did not go upwind very well.

If I get a pointer fin what size should I get to cover most winds in my area ranging from 12km to 30km? My body weight is 140lbs and their is a 70cm tail width on my formula board. I am using a 7.5m sail with it, but may get something like an 8.5 or 9m for light winds.
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joethewindsufa



Joined: 10 Oct 2010
Posts: 902
Location: Montréal

PostPosted: Sun Jun 25, 2017 5:48 pm    Post subject: Reply with quote

I was going to guess 60 cm for an 8.5 since I use 56 cm slalom fin on JP SLW92 for that sail size
James' calculator suggests 64 cm
since you are lighter, perhaps 60 cm is enuff ??
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zirtaeb



Joined: 03 Jul 2009
Posts: 3627

PostPosted: Mon Jun 26, 2017 11:14 am    Post subject: Reply with quote

Small changes in fin sizing affect the handling of the board greatly.
We use 62 cm fins (F-4 soft) when going Formula and 6.7 or 7.5, which is the max sizing we own or carry. About 160 lbs rider's.
Smaller just allows the board to spin out in low winds, while bigger starts railing up when powered up, especially if the fin is stiffer, like an R-13 M at 62 cms.
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